» 


* 


C 


C 


PUMPING  APPARATUS 


FOR  THE 


RICHMOMD 


Digitized  by  the  Internet  Archive 
in  2017  with  funding  from 

University  of  Illinois  Urbana-Champaign  Alternates 


https://archive.org/details/specificationofnOOgeye 


NEW  PUMPING  APPARATUS 


FOR  THE 


Head-Gates. 

« 

The  head-gates  are  to  be  composed  of  three  separate  gates, 
to  be  worked  with  screws  and  brass  nuts  of  the  sizes  shown 
on  plan — said  gates  to  be  held  by  iron  ways,  secured  to  the 
end  of  the  iron  inlet  flume  ; the  lifting  motion  to  be  made  to 
correspond  with  the  present  ones. 

Racks. 

The  Racks  are  to  be  formed  with  wrought  iron  strips,  three 
inches  by  one-half  inch,  with  the  end  parts  as  shown  on  the 
plan  ; the  strips  are  to  be  placed  two  inches  from  centre  to 
centre,  bolted  together  in  four  sections  by  means  of  bolts 
three-quarter  of  an  inch  in  diameter — small  pieces  of  gas  pipe 
are  to  hold  the  strips  to  their  respective  distances ; they  are 
to  form  a total  length  of  twenty  feet  four  inches  ; they  are  to 
be  secured  top  and  bottom  to  iron  bars  secured  to  the  wall,  in 

~ such  a manner  as  to  allow  the  head-gates  to  slide  up  and 
* down. 

Flume. 

The  Flume  is  to  be  made  of  boiler  iron  J-inch  thickness  of 
4 metal,  strengthened  with  JL  iron  three  inches  high,  four  inches 
wide — average  thickness  five-sixteenth  iron,  riveted  every  30 
inches — length  of  the  flume  3T  feet  1/  ; area,  12  feet  by  6 feet 

_ 6 inces  in  the  middle,  with  curved  top  and  rounded  corners 

- 

I 

CO* 


4 


&fc  bottom  as  shown  on  the  plan,  fiach  end  is  to  have  a east 
iron  angle  iron  or  flange,  made  as  shown  on  the  plan — the 
said  angle  irons  to  he  doubly  rivetted  and  to  be  firmly  secured 
on  one  end  to  the  head-gate  wall,  and  at  the  other  end  to  the 
turbine  chamber.  This  flume  is  to  be  provided  with  four  cast 
iron  seats,  made  true  to  the  centre  lines  of  the  pumps,  so  as 
to  be  able  to  secure  thereon  the  four  inlets  to  the  pumps. 
The  flange  on  the  head-gate  side  is  to  have  two  substantial 
divisions  to  serve  as  base  to  the  ways  for  the  head-gates.  A 
side  view  and  plan  will  give  the  exact  dimensions  of  said 
flanges. 

At  the  place  indicated  on  the  plan,  an  air  column  is  to  be 
placed  in  the  maimer  thereon  shown.  A depression  in  the 
flume  is  to  be  so  arranged  as  to  receive  the  waste  pipe 
as  shown  on  the  plan.  This  flume,  like  all  other  machinery 
that  is  to  form  'part  of  this  pumping  apparatus^  is  to  have 
three  coats  of  paint  inside  and  outside,  and  a coat  of  varnish 
on  the  outside.  The  last  outside  coat  to  be  put  on  when  the 
machinery  is  ready  to  run — the  tint  to  be  given  by  the  Chair- 
man of  the  Committee  on  Water.  In  the  above  condition 
said  flume  is  to  be  water  tight  under  six  pounds  pressure  to 
the  square  inch. 

Discharge  Pipe  with  Yalve. 

This  pipe  is  to  be  made  of  cast  iron  10  inches  diameter,  § 
thickness  of  metal,  and  to  reach  in  an  incline  from  the  depres- 
sion in  the  flume  to  the  wheel-pit — at  the  end  nearest  to  the 
flume  there  is  to  be  a regular  10-inch  stop-cock  with  brass 
face. 

Turbine. 

This  Turbine  is  to  be  of  the  Jouval  system,  with  iron  cham- 
ber, bronze  buckets,  in  moveable  wheel,  and  wholly  made  of 
first-class  workmanship  ; it  is  be  complete  in  itself  with  gate 
and  gate-motion  , with  step  and  watering  apparatus  for  the 


; Wrought  iron  shaft  and  upper  pedestal  to  hold  the  same, 
and  is  to  be  tested  by  its  duty,  which  duty  consists  in  being 
able  to  propel  two  double-acting  pumps  17  inches  in  diame- 
ter, six  feet  stroke,  at  a velocity  of  eleven  revolutions  per 
minute,  with  a head  and  fall  of  ten  feet — the  said  turbine  is 
to  be  guaranteed  to  give  & useful  effect  of  the  water  used  of 
eighty  per  cent.  Should  it  be  deemed  necessary  by  the  Com- 
mittee on  Water  and  Engineer  that  the  contracting  party  be 
obliged  to  prove  the  efficiency  of  the  said  turbine,  then  it  is 
also  understood  that  the  quantity  of  water  should  be  rated  by 
“ Du  Buat’s  ” table.  The  expense  of  said  experiments  to  be 
equally  divided  by  the  two  contracting  parties.  Under  the 
above  conditions,  the  water  is  to  be  lifted  to  a height  of  190 
feet.  The  area  of  the  flume  is  75J  square  feet.  This  flume 
supplies  the  two  pumps  before  it  reaches  the  turbine. 

The  chamber  over  the  turbine  is  to  be  made  in  cast  iron,  and 
is  to  be  so  proportioned  as  to  receive  without  sensible  tremor  ; 
the  weight  and  thrust  of  bevel  wheels  and  counter-shaft  when 
in  motion,  at  the  velocity  indicated  above.  Provision  in  the 
general  arrangement  of  the  turbine  should  be  made  so  as  to 
be  able  to  remove  the  step  and  turbine  wheel  without  displa- 
cing any  machinery  above  it. 

Gearing. 

The  Gearing  is  to  be  composed  of  a set  of  bevel  and  a set 
of  spur  wheels,  with  their  shafts  and  bearings  and  super- 
structure to  hold  them  as  described  below. 

Bridge  on  top  of  Turbine  Chamber. 

This  bridge  is  to  be  made  and  put  up  so  as  to  support  the 
first  pedestal  of  horizontal  or  counter-shaft,  and  the  pedestal 
of  the  turbine  shaft — the  feet  are  to  rest  on  the  chamber, 
the  proportions  are  to  be  as  shown  on  the  plan. 


Bridge  cm  top  op  Foundation  (xirder  por  <3rank  Shaft* 

This  Bridge,  on  which  provision  is  to  be  made  for  the  re- 
ception of  the  second  pedestal  for  the  counter-shaft,  is  to  be 
made  in  five  separate  parts,  firmly  secured  to  each  other  by 
reamed  bolts  and  well  secured  to  the  main  girder,  whereon  it 
is  to  rest — the  form  and  thickness  of  metal  is  to  be  taken  from 
the  plan. 

Pedestals  for  Horizontal  or  Counter-Shafts. 

These  Pedestals  are  two  in  number,  and  are  to  be  made  in 
cast  iron,  lined  with  Babbitt  metal ; they  are  to  be  12  inch 
bore  and  20  inches  length  of  bearing  ; they  are  to  be  made 
according  to  plan  and  have  tallow  cups  with  brass  covers 
each  with  three  oil  cups — they  are  to  be  held  down  with  four 
bolts  1J  inches  in  diameter  in  each  case. 

Counter-Shafts. 

This  shaft  is  to  be  made  in  cast  iron — it  is  to  be  cast  on 
end,  with  a sinking  head  of  the  same  diameter  as  the  shaft, 
and  not  less  than  24  inches  long.  The  total  length  of  this 
shaft  when  finished,  is  to  be  11  feet  2J  inches ; its  diameter 
is  to  be  when  turned,  12  to  14  inches,  as  shown  on  the  plan  ; 
it  is  to  be  turned  all  over  and  to  be  fitted  and  key-seated,  and 
keyed  and  put  in  place  to  and  with  the  parts  marked  thereon, 
namely  : morticed  bevel  wheel  and  spur  pinion.  Each  end  is 
to  have  a neat  brass  cap,  polished  on  the  outside,  so  as  to 
serve  as  ornament  to  said  shaft. 

Mortice  Bevel  Wheels. 

These  Wheels  are  to  be  4J  inch  pitch,  20  inches  face — the 
bevel  pinion  is  to  have  41  teeth  in  iron,  which  are  to  be  most 
carefully  dressed  by  the  radial  dresser,  to  a template  to  be 
furnished  by  the  engineer — it  is  to  be  keyed  and  put  on  to 
the  turbine  shaft,  and  held  up  besides  by  means  of  a collar, 
which  collar  is  to  be  firmly  secured  to  said  shaft.  The  mor- 
tice wheel  is  to  have  67  teeth,  they  are  to  be  made  of  dry 


7 


hickory,  well  soaked  in  tallow  and  secured  in  the  manner 
shown  on  the  plan — the  whole  rim,  which  like  the  arms  and 
hub,  is  to  be  made  in  cast  iron,  will  have  to  be  turned,  and 
the  hub  will  have  to  be  bored  out  to  suit  the  counter-shaft  to 
which  it  is  to  be  secured  by  means  of  two  wrought  iron  keys, 
two  inches  wide,  placed  at  right  angles  to  each  other. 

Mortice  Spur  Wheels. 

These  Wheels  are  also  to  have  wood  and  iron  teeth,  five 
inches  pitch,  24  inches  face  tof  teeth — the  pinion  is  to  have 
t 38  teeth,  it  is  to  be  bored  out  true  and  to  be  prepared  with 
two  key-seats  ; the  teeth  are  to  be  dressed  perfectfully  true  to 
a template  to  be  furnished.  The  large  mortice  spur-wheel  is 
to  have  75  teeth  ; the  wheel  is  to  be  made  in  two  parts,  as 
shown  in  plan,  and  secured  to  each  other  by  means  of  bolts 
and  keys  ; the  rim  is  to  be  double-bridged,  so  as  to  make  each 
tooth  in  three  sections.  The  hickory  teeth  are  to  be  dry, 
well-soaked  in  tallow,  and  when  in  place  are  to  be  firmly 
held  by  keys  and  screws.  The  centre  of  the  wheel  is  to  be 
bored  out  and  double  key-seated,  and  well-fitted  to  the  crank 
shaft. 

The  Crank  Shaft. 

The  Crank  Shaft  is  to  be  made  in  cast  iron  of  21  feet  six 
inches.  Total  length  is  to  be  made  in  two  parts,  as  shown 
on  plan.  They  are  to  be  cast  on  end  with  sinking  heads  of 
same  diameter  of  24  inches  length  ; through  the  centre  there 
s is  to  be  a core  of  five  inches,  the  diameter  when  turned  is  to 
be  sixteen  inches.  The  coupling  is  to  be  put  togeter  with 
reamed  bolts,  the  number  and  size  as  shown  in  plan  ; the  ends 
are  to  have  tasteful,  well-polished  brass  caps,  18  inches  in  di- 
ameter. Said  shaft  is  to  be  turned  all  over,  and  have  fitted 
thereon  and  secured  thereon  the  mortice  spur-wheel  and  the 
two  crank  wheels. 


8 


Crank-Shaft  Pedestals. 

These  pedestals  are  to  be  two  in  number — they  are  to  be 
made  in  cast  iron,  with  moveable  side  boxes.  The  bottom 
part  of  the  pedestals  and  said  side  boxes  are  to  be  lined  with 
Babitt  metal.  They  are  to  be  proportioned  and  secured  ac- 
cording to  detailed  plan  ; the  bore  of  them  is  to  be  14  inches, 
with  a breadth  of  bearing  of  20  inches.  The  distance  from 
centre  of  pedestal  to  base  is  to  be  14  inches.  The  caps  are  r 
to  overlap  and  fit  well  the  sides ; they  have  to  have  ornamental 
brass  caps  with  oil  cups.  The  caps  are  to  be  held  down,  each 
by  two  long  bolts,  two  inches  in  diameter.  The  pedestals 
themselves  are  to  be  held  down,  each  by  four  bolts  two  inches 
in  diameter.  The  side  boxes  are  each  to  have  two  set-screws 
of  two  inches  in  diameter,  with  back-plate  strong  enough  to 
receive  the  end  thrust. 

Crank  Wheels. 

The  Crank  Wheels  are  to  be  two  in  number  ; they  are  to  be 
made  in  cast  iron  and  are  to  be  eight  feet  outside  diameter 
when  finished.  They  are  to  be  made  with  double  disk  1 J inches 
in  thickness,  joining  a rim  (as  shown  on  plan)  of  eight  inches 
in  width.  These  disks  are  to  be  united  by  means  of  six  radial 
ribs  in  each  case,  and  each  wheel  is  to  be  provided  with  a boss 
(as  shown  on  plan,)  which  boss  is  to  be  most  carefully  bored 
out  conical  to  receive  the  crank  pin,  wherein  it  is  to  befitted 
and  keyed  so  as  to  present  a perfectly  true  line  through  its 
axis  of  three  feet,  from  centre  to  centre  of  the  wheel.  Those  1 
wheels,  as  described  in  the  itom  crank-shaft,  are  to  be  most 
carefully  fitted  to  the  crank  shaft ; the  crank  pins  are  to  be 
placed  at  right  angles  and  secured  to  the  crank-shaft,  each  by  1 
means  of  2 wrought  iron  keys  2|  inches  wide,  1J  inches  thick. 

The  rims  are  to  be  turned  and  polished,  and  the  hubs  are  to 
be  squared  and  made  to  fit  against  the  crank-shaft  pedestals. 


9 


Main  Girders. 

The  Main  Girders  under  the  crank-shaft  are  to  he  two  in 
number ; they  are  intended  to  receive  the  principal  strain  of 
the  gearing.  They  are  to  be  made  in  cast  iron,  of  the  C cross 
section,  of  20  inches  breadth  ; the  total  length  of  each  is  to  be 
IT  feet  three  inches  ; the  thickness  of  metal  is  to  be — bottom, 
top  and  sides,  1J  inches  The  girders  are  to  be  arranged 
with  ribs  and  fillets,  as  shown  on  plan ; one  is  to  be  of  an  S 
shape — they  are  both  to  be  held  down  with  five  bolts  1} 
inches  in  diameter  ; three  of  said  bolts  to  rest  on  bosses  to  be 
provided  at  the  bottom  part,  and  the  two  nearest  bolts  to  the 
crank-shaft  pedestals  are  to  go  entirely  through  the  girders. 
In  the  parts  forming  the  seats  of  the  two  pedestals  and 
also  where  the  bridge  rests  on,  finally  at  those  parts  connect- 
ing with  the  pump  girders,  the  thickness  of  metal  in  place  of 
being  1J  inches  is  to  be  increased  to  2f  inches,  so  that  when 
faced  in  the  planning  machine  there  is  left  a thickness  of  two 
inches  on  those  parts. 

Foundation  Bolts.  . 

The  Foundation  Bolts  are  to  be  ten  in  number  ; they  are  to 
be  If  inches  in  diameter — they  are  to  be  long  enough  to  form 
a wall  space  of  6 feet  61,  the  head  being  formed  by  a swelling 
wherein  a key  is  secured  against  a cast  iron  plate  ten  inches 
square,  2J  inches  thick,  with  bevelled  sides.  In  addition  to 
the  bolts  named  above,  it  is  understood  that  the  above-named 
work  does  include  all  bolts  necessary  to  be  connected  together 
and  to  be  secured  to  the  walls  and  pump  girders. 

Pumps. 

The  Pumps  are  to  be  of  the  kind  known  as  “ Rubber  Valve 
Pumps.”  They  are  to  be  two  in  number,  to  be  17  inches  in 
diameter,  and  6 feet  stroke.  They  are  to  be  placed  in  a hori- 
zontal position  and  work  at  right  angles  to  each  other. 

2 


10 


Crank  Pins. 

They  are  to  be  two  in  number  ; they  are  to  be  made  of  tool 
steel  and  present  a diameter  of  five  inches  as  bearing  where 
the  connecting  rod  connects  with  said  bearing,  to  be  8 inches 
width  ; on  each  side  of  said  bearing  there  is  to  be  a collar  7 
inches  in  diameter.  The  whole  length  of  each  pin  is  to  be  22 
inches  when  finished — the  parts  resting  in  the  crank  wheels 
are  to  be  turned  conical,  5 inches  to  4J  inches,  and  most 
carefully  fitted  and  ground  therein  ; each  pin  is  to  be  secured 
to  its  crank  wheel  by  means  of  a wrought  iron  key  one  inch 
thick,  2J  wide,  with  strongly  rounded  corners. 

Guides  and  Guide  Seats. 

The  Guides  and  the  Guide  Seats  are  to  be  four  in  number ; 
they  are  to  be  made  in  cast  iron  and  with  the  view  of  obtain- 
ing a perfectly  sound  bearing  surface  for  the  cross-head 
elides.  The  guides  are  to  be  cast  on  end  with  sinking  heads. 
The  total  length  of  each  guide-seat  to  be  8 feet  2 inches  ; the 
guides  are  to  be  7 feet  8 inches — they  are  to  be  held  firmly 
together  and  to  the  foundation  plates,  each  one  by  means  of 
four  hold-down  bolts,  If  inches  in  diameter,  turned  and  made 
to  fit.  The  guides  are  to  be  plained  and  are  to  present  each, 
two  perfectly  true  surfaces  free  from  scoria  ; they  are  to  be 
set  at  right  angles  to  each  other  and  of  2-J  by  2J  thickness. 
The  said  guides  are  to  be  put  up  so  as  to  form  parallel  bear- 
ings with  the  longitudinal  axis  of  the  pumps.  The  sections 
of  the  guide-seats  are  as  follows  : base  of  seat,  8 feet  2 inches, 
ten  inches  wide,  1J  inches  thick  when  finished;  side,  16J 
inches  high,  1J  inches  thick  with  fillets. 

In  addition  there  are  to  be  four  ribs  and  four  bosses  to  re- 
ceive the  the  hold-down  bolts,  the  top  plate  is  to  be  1J  inches 
thick. 


v 


ii 


Connecting  Rods. 

Two  Connecting  Rods  are  required — they  are  to  be  made  of 
wrought  iron,  with  wrought  straps  and  keys  and  brass  boxes, 
the  whole  rods  are  to  be  turned,  fitted  and  polished.  Each 
is  to  be  15  feet  long  from  centre  to  centre,  the  brasses  are  to 
be  of  the  best  machinery  metal,  and  are  to  be,  when  bored,  5 
♦ inches  in  diameter  and  8 inches  wide  ; the  main  body  at  each 
end  is  to  be  5 inches  in  diameter  and  7J  inches  in  diameter  in 
the  middle.  Each  rod  will  have  to  have  a set  of  wrought  iron 
braces  1J  inches  in  diameter,  as  shown  on  the  plan.  The 
brasses  will  have  to  be  provided  with  oil  cups. 

Cross-Heads. 

The  Cross-heads  are  to  be  two  in  number — they  are  to  be 
made  of  wrought  iron,  with  centre-bearing  5 inches  in  diame- 
ter, 8 inches  long  ; the  ends  have  to  have  brass  gibbs  as  shown 
on  the  plan.  The  piston  rods  in  each  case  is  to  be  thereon 
secured  by  key  and  nut  as  shown.  The  exposed  part  is  to  be 
polished. 

Piston  Rods. 

There  are  to  be  two  rods,  they  are  to  be  made  out  of  the 
best  Bagnal  (English)  iron,  (or  other  iron  as  good) — they  are 
to  be  four  inches  in  diameter  in  the  main  body.  Total  length 
of  each,  twelve  feet  one  inch.  A substanoial  flat  key  is  to 
secure  each  rod  to  its  piston. 

Pistons. 

j They  are  to  be  two  in  number ; they  are  to  be  made  in  cast 

iron,  length  of  bearing  10  inches;  thickness  of  follower  2J; 
hub  of  piston  101  inches  in  diameter,  with  ribs  on  which  a 
conical  ring  of  8f  inches  long  is  to  slide.  On  this  conical  ring 
are  to  be  arranged  wooden  segments  with  the  end  of  the  grain 


18 


outwards.  This  wood  is  to  be  “ apple  wood  **  and  thoroughly 
soaked  in  tallow.  This  wood  is  to  be  made  in  four  layers  of 
blocks,  eight  pieces  in  each  layer,  2J  inches  thick — the  blocks 
to  be  fitted  to  the  bevel,  and  curve  of  the  cone,  and  so  ar- 
ranged that  when  the  cone  is  thrust"  in  by^four  screws,  one 
inch  in  diameter,  tapped  into  the  follower — all  the  blocks  are 
forced  outwards.  The  followers  are  to  be  secured  to  the  piston 
heads  each  by  four  tap  bolts  of  one  inch  in  diamter.  The 
hubs  of  the  pistons  are  to  be  bored  conical — the  whole  as 
shown  on  plan. 

Foundation  Plates. 

Each  pump  is  to  have  two  plates  of  the  shape  ; each  plate 
is  to  be  formed  of  two  parts,  which  parts  are  to  be  fitted  to- 
gether and  form  a base  of  25  feet,  10  inches  in  length  ; the 
width  of  these  plates  is  10  to  12  inches,  and  the  depth  is  12 
inches  ; each  of  the  4 plates  is  to  have  5 bosses  for  foundation 
bolts,  to  be  placed  between  the  bottom  and  top  plates,  at  dis- 
tances shown  on  the  plan.  In  the  same  plates,  on  the  upper 
part,  provision  is  also  to  be  made  to  secure  the  bottom  or 
lower  valve  chests,  also  for  the  stay  rods  for  each  large  air 
vessel,  also  the  guide  seats,  the  shape,  thickness  of  metal,  and 
the  necessary  ribs  to  strengthen  the  plates,  to  be  placed  as 
shown  on  the  plan.  The  top  part  is  to  be  faced  the  whole 
length,  also  where  the  plates  connect  with  the  main  girders 
under  the  gearing. 

Foundation  Bolts. 

The  foundation  bolts  for  the  two  pumps  are  to  be  ten  in 
number  ; for  each  pump,  they  are  to  be  of  one  and  a quarter 
inch  diameter,  and  are  to  be  long  enough  to  give  a wall  space 
of  six  feet,  six  inches.  The  keys  on  these  bolts  are  to  be 
like  on  those  bolts  wanted  for  gearing  parts,  of  3J  inch 
width  and  J inch  in  thickness  ; they  are  to  have  a head  of  not 
less  than  inches  in  length,  and  be  provided  with  same 


kind  of*  washer  as  described  above  in  the  foundation  boits  for 
gearing  part. 

Valve  Chests. 

These  valve  chests  are  to  be  four  in  number — namely,  two 
for  each  pump,  and  to  be  distinguished  from  each  other  as 
“ front  chests  ” and  “back  chests  they  are  to  be  made  of 
cast  iron,  and  it  is  of  particular  importance  that  they  should 
be  sound  and  cast  to  the  thickness  indicated  on  the  plans, 
namely,  If  in  the  body. 

Each  chest  is  to  be  cast  into  two  parts,  forming  the  lower 
and  upper  part ; on  top  of  the  latter  chests  semi-round  air 
vessels  are  to  be  placed;  all  the  flanges  are  to  be  faced,  and 
present  a thickness  of  2f  inches,  and  a breadth  of  four  inches, 
when  finished. 

The  inside  surface  of  each  chest  is  to  be  34f  2 by  34 fT,  with 
strongly  rounded  corners.  The  seats  for  valve  seats,  and 
faces  for  hand  holes,  and  seat  of  air  vessel,  and  flanges  of 
inlet  and  outlet  pipes  ; also  the  seats  of  covers  and  lugs 
resting  on  foundation  plates,  are  all  to  be  faced.  All  the 
bolts  used  in  securing  the  valve  chest  parts  together,  and  to 
secure  thereon  the  covers,  hand  hole  plates,  inlet  and  outlet 
pipes  and  air  vessels,  should  all  be  turned  to  If  inch  in 
diameter,  and  well  fitted  to  the  holes,  and  to  be  not  more 
than  5J  inches  apart  from  centre  to  centre.  Each  chest  is  to 
be  provided  with  4 lugs,  as  shown  on  the  plan,  and  to  be 
secured  to  the  foundation  plates  by  means  of  bolts  1J  inches 
in  diameter ; also  keys  as  shown. 

Valve  Seats. 

The  valve  seats  are  to  be  eight  in  number,  for  the  two 
pumps  ; they  are  to  be  made  in  cast  iron ; each  seat  to  be 
made  in  three  parts,  bolted  together  and  secured  into  the 
chests,  as  shown  on  the  drawing.  Care  should  be  taken  to 


obtain  a surface  free  from  scoria  on  the  upper  side.  Sack 
seat  is  to  have  nine  grated  openings,  (with  centres  for  the 
valve  stems ;)  they  are  to  form  the  seats  to  as  many  rubber 
valves.  The  seats  are  to  be  fitted  and  faced. 

Valves. 

The  valves  are  to  be  made  with  India  rubber  disks,  nine 
inches  in  diameter  and  one  and  three-eighths  inches  in 
thickness,  with  wrought  iron  stems,  nuts,  cups,  follower  and 
steel  spring,  as  shown  on  drawing. 

Inlet  and  Outlet  Pipes. 

These  pipes  are  to  be  made  in  cast  iron — two  are  wanted  of 
each  kind  ; they  are  to  fit,  and  have  to  be  secured  between 
the  front  and  back  valve  chests.  Thickness  of  metal  at  inlet 
pipes — one  inch,  and  at  outlet  pipe,  1J  inch  at  the  round 
parts.  The  flanges  in  each  case  have  to  have  a half  inch  ad- 
ditional thickness — inside  diameter, 

Pump  Barrels. 

The  pump  barrels  are  two  in  number ; they  are  to  be  made 
in  cast  iron,  cast  on  end,  with  sinking  head  18  inches 
long,  of  the  same  diameter  as  the  body  of  the  barrel ; they 
are  to  be  bored  out  to  17  inches.  Thickness  of  metal — If 
inch  when  bored  out ; length  of  pump  barrels  and  inlet  and 
outlet  pipes — 7 feet  3 inches.  The  flanges  in  each  case  have 
to  be  faced  on  the  sides  and  at  the  top. 

Barrel  Heads. 

The  barrel  heads  are  to  be  five  in  number  for  each  pump  ; 
they  are  to  be  of  the  outside  diameter  of  the  flanges  of  pump 
barrels  ; they  are  to  be  turned  and  polished,  and  secured  as 
above  described. 

Hand  Holes. 

The  hand  holes  are  to  be  8 in  number  for  each  pump ; they 
are  to  be  secured  as  shown  on  plan. 


15 


Air  Vessels. 

Each  pump  is  to  have  three  air  vessels — two  small  ones 
and  one  large  one,  of  dimensions  as  shown  on  the  plan  ; they 
should  be  cast  top  down  with  sinking  heads.  Thickness  of 
metal,  If  inches. 

The  parts  of  the  pump  exposed  to  pressure,  are  to  have 
tight  joints,  and  to  be  tested  to  a pressure  of  170  lb.  to  the 
square  ^nch. 

4k  

GENERAL  SPECIFICATION. 

^ There  are  to  be  furnished — 

1.  One  extra  step  of  lygnum  vitae. 

2.  A complete  set  of  hickory  teeth  for  the  bevels  and  spur 
wheels,  cut  out  and  made  ready  to  be  driven  into  the  mortices. 

3.  Nine  extra  valves,  with  a complete  seat,  is  to  be  fur- 
nished. 

4.  Any  obscurity  as  to  the  meaning  of  the  plans  and  speci- 
fication, is  to  be  explained  by  the  engineer,  whose  interpreta- 
tion shall  be  binding. 

5.  All  the  parts  passing  through  the  walls,  should  be  fur- 
nished at  the  earliest,  so  they  can  be  walled  in  as  the  walls 
are  being  put  up. 

6.  No  allowance  for  extra  work,  except  upon  a written 
agreement  signed  by  both  contracting  parties. 

7.  The  whole  of  the  work  to  be  paid  upon  estimates  made 
by  the  engineer  every  sixty  days,  less  ten  per  cent.,  which  is 
to  be  retained  upon  each  estimate  until  the  work  is  put  up 
and  approved  by  the  Engineer,  and  accepted  by  trie  Superin- 
tendent and  Committee  on  Water  of  the  city  of  Richmond. 

v 8.  The  time  of  completion  of  the  work,  to  be  eight  months 

from  the  time  of  signing  the  contract 

EMILE  GEYELIN, 
Hydraulic  Engineer. 


